ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación descargar pdf (Pagina 323)

Coexistence of PLC and Wired Ethernet

The coexistence of PLC and wired networks (Ethernet cable, optical fiber, cable TV,

telephone cable, and so forth) does not generate disturbances since all the frequency

bands used by these technologies are outside of the PLC frequency bands.

Only the VDSL distribution technology, which will allow reaching throughputs

of several tens or so of megabits per second over copper telephone cables, will use

the 138-kHz to 12-MHz frequency band. Therefore, it is likely to be subjected to

potential interference, since PLC technologies use the 2- to 30-MHz band emitting

an electromagnetic noise around the electrical wirings, which can reach 70 to 80

dBμV (“quasipeak” value).

Figure 13.11 illustrates the various VDSL bands and the place of the PLC bands

in this frequency space.

In the field of local area networks, there are no problems with coexisting PLC

and wired technologies so that wired technologies are frequently used as backbones

for PLC local area networks.

Advantages and Disadvantages of Network Technologies

To make a comparison between PLC technologies and other network technologies,

Table 13.2 summarizes the main advantages and disadvantages of each of these

technologies.

Some of them have developed to a large extent because they met requirements

by providing functionalities not provided by other technologies (price, easy deploy-

ment, open-endedness, security, and so forth).

Optimizing Network Architectures

The multiplication of currently available network technologies makes it legitimate

to look for the best of each technology in order to build an optimal network archi-

tecture.

For this purpose, it is important to analyze the specifications for the network to

be implemented and to list the most important characteristics of the building to be

equipped.

304 Hybrid PLC

Figure 13.11 Potential interference between VDSL and PLC bands

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ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación Pagina 323